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 #include &lt;QtGui&gt;

 #include &quot;mainwindow.h&quot;

 MainWindow::MainWindow()
     : QMainWindow()
 {
     area = new SvgWindow;

     QMenu *fileMenu = new QMenu(tr(&quot;&amp;File&quot;), this);
     QAction *openAction = fileMenu-&gt;addAction(tr(&quot;&amp;Open...&quot;));
     openAction-&gt;setShortcut(QKeySequence(tr(&quot;Ctrl+O&quot;)));
     QAction *quitAction = fileMenu-&gt;addAction(tr(&quot;E&amp;xit&quot;));
     quitAction-&gt;setShortcut(QKeySequence(tr(&quot;Ctrl+Q&quot;)));

     menuBar()-&gt;addMenu(fileMenu);

     QMenu *rendererMenu = new QMenu(tr(&quot;&amp;Renderer&quot;), this);
     nativeAction = rendererMenu-&gt;addAction(tr(&quot;&amp;Native&quot;));
     nativeAction-&gt;setCheckable(true);
     nativeAction-&gt;setChecked(true);
     #ifndef QT_NO_OPENGL
     glAction = rendererMenu-&gt;addAction(tr(&quot;&amp;OpenGL&quot;));
     glAction-&gt;setCheckable(true);
     #endif
     imageAction = rendererMenu-&gt;addAction(tr(&quot;&amp;Image&quot;));
     imageAction-&gt;setCheckable(true);

     #ifndef QT_NO_OPENGL
     rendererMenu-&gt;addSeparator();
     highQualityAntialiasingAction = rendererMenu-&gt;addAction(tr(&quot;&amp;High Quality Antialiasing&quot;));
     highQualityAntialiasingAction-&gt;setEnabled(false);
     highQualityAntialiasingAction-&gt;setCheckable(true);
     highQualityAntialiasingAction-&gt;setChecked(false);
     connect(highQualityAntialiasingAction, SIGNAL(toggled(bool)), this, SLOT(setHighQualityAntialiasing(bool)));
     #endif

     QActionGroup *rendererGroup = new QActionGroup(this);
     rendererGroup-&gt;addAction(nativeAction);
     #ifndef QT_NO_OPENGL
     rendererGroup-&gt;addAction(glAction);
     #endif
     rendererGroup-&gt;addAction(imageAction);

     menuBar()-&gt;addMenu(rendererMenu);

     connect(openAction, SIGNAL(triggered()), this, SLOT(openFile()));
     connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
     connect(rendererGroup, SIGNAL(triggered(QAction *)),
             this, SLOT(setRenderer(QAction *)));

     setCentralWidget(area);
     setWindowTitle(tr(&quot;SVG Viewer&quot;));
 }

 void MainWindow::setHighQualityAntialiasing(bool highQualityAntialiasing)
 {
     area-&gt;setHighQualityAntialiasing(highQualityAntialiasing);
 }

 void MainWindow::openFile(const QString &amp;path)
 {
     QString fileName;
     if (path.isNull())
         fileName = QFileDialog::getOpenFileName(this, tr(&quot;Open SVG File&quot;),
                                                 currentPath, &quot;*.svg&quot;);
     else
         fileName = path;

     if (!fileName.isEmpty()) {
         area-&gt;openFile(fileName);
         if (!fileName.startsWith(&quot;:/&quot;)) {
             currentPath = fileName;
             setWindowTitle(tr(&quot;%1 - SVGViewer&quot;).arg(currentPath));
         }
     }
 }

 void MainWindow::setRenderer(QAction *action)
 {
     #ifndef QT_NO_OPENGL
     highQualityAntialiasingAction-&gt;setEnabled(false);
     #endif

     if (action == nativeAction)
         area-&gt;setRenderer(SvgWindow::Native);
     #ifndef QT_NO_OPENGL
     else if (action == glAction) {
         area-&gt;setRenderer(SvgWindow::OpenGL);
         highQualityAntialiasingAction-&gt;setEnabled(true);
     }
     #endif
     else if (action == imageAction)
         area-&gt;setRenderer(SvgWindow::Image);
 }</pre>
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